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Would you like to know exactly how much power you can make with any of our injectors? Would you like an easy to use online horsepower calculator? Are you wondering "Who is the guy with the funny hair glaring at me from the top of the page?" That man is James Watt, the inventor of the aftermarket performance industry. If you thought he invented the steam engine, you were wrong! A few hundred years ago, he made great improvements to Thomas Newcomen's steam engine, increasing its power and efficiency. He then went into business selling these improved engines. Since horses were doing all the heavy lifting in those days, he wisely related the work capacity of the machine to that of a horse, coining the term "horsepower" Since then, millions of people have become rich selling engines with the promise of increased horsepower. Get it?
The Excel based calculator is a bit different from the other injector sizing calculators you have seen online. This treats the injector as a dynamic device considering the dead time, and the time required between pulses for linear operation. As a result, the numbers are accurate as opposed to a rough guess considering static flow, and an arbitrary maximum duty cycle. Take note of the following instructions listed below the screen capture, and then download/open the file in your browser and have at it.
2. Horsepower is calculated in 500 RPM increments. If you roll your mouse over a calculated point on the graph, the value will be displayed. 3. Using the drop down box, choose the injection frequency. The choices are Two Revs Per Injection to be used for four stroke full sequential systems, or One Rev Per Injection to be used for two stroke, Wankel, or batch fired four stroke engines. 4. Choose fuel pressure from the drop down box. Note that the d in psid stands for differential. In laymens terms, that means the difference between the pressure at the injector inlet, and the injector outlet. If you do not understand the difference between gauge and differential pressure, please look it up. This is absolutely critical, and anyone tuning needs to understand this. (I have an article planned and hope to have it posted soon, until then Google should turn up something.) 5. Use the slider control to choose the BSFC to be used for the calculations. A very rough guide is listed below. Note that these are rough estimates and accurate numbers come from engine dyno testing. 6. This one should be self explanatory. Use the slider control to choose the total number of injectors on the engine. 7. There are separate calculators for each of the three fuel options. Click the tabs at the bottom of the page to open the appropriate calculator. The following are rough guidelines for BSFC based on engine type and fuel.
Naturally Aspirated
Boosted Injector Dynamics Horsepower Calculator Please let us know if you find this helpful, and contact us through the menu bar on the right if you have any questions.
Paul Yaw
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